US4110127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Procedure for depositing a protective precoating on surfaces of zinc-coated ferrous metal parts against corrosion in presence of water
Assignee: International Lead Zinc Research Organization Inc
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Filing: 1976-06-21
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Granted: 1978-08-29
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Expires: 1996-06-21
Abstract
Abstract Solution and procedure of depositing a coating on the surfaces of zinc-coated ferrous metal parts which protects against corrosion in the presence of water. The solution is made up by adding to water, per liter of final solution, of 1 to 40 grams of sodium metasilicate, 14 to 40 milliliters of phosphoric acid, density 1.71 g/ml, from 1 to 40 grams of sodium nitrate, from 10 to 50 grams of anhydrous zinc chloride and the pH is adjusted to a value between 2.3 and 3.8. Preferably nickel chloride is added. For use, the solution is heated to a temperature ranging from 15° to 75° C and brought into contact with the parts to be treated for a period from 20 to 72 hours. The deposit is continuous, hard, resistant to shocks and abrasion and imparts an efficient and lasting protection to galvanized parts in corrosive waters. The invention is useful for the protection of piping in the building industry.
Inventors
- 👤 Michel Longuepee
- 👤 Noel Dreulle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:23
CPC Classifications
C; C09; C09D; C09D1/00; C09D1/02; C09D5/00; C09D5/08; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C23C22/08; C23C22/12; C23C22/13; C23C22/23; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12583
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
111 words
A process for depositing a protective coating on the surface of an article having a zinc surface, comprising contacting with said surface an aqueous solution containing, per liter of solution, metasilicate equivalent to 1 to 40 grams of sodium metasilicate, phosphate equivalent to 14 to 40 milliliters of phosphoric acid having a density of 1.71 g/ml, nitrate equivalent to 1 to 40 grams of sodium nitrate, and zinc equivalent to 10 to 50 grams of anhydrous zinc chloride, said solution having a pH between 2.3 and 3.8, and a temperature between 15° and 75° C., for between 20 and 72 hours at the aforesaid temperature, and rinsing said surface with water.
Claim 2
Dependent Claim
111 words
A process for depositing a protective coating on the surface of an article having a zinc surface, comprising contacting with said surface an aqueous solution containing, per liter of solution, metasilicate equivalent to 1 to 40 grams of sodium metasilicate, phosphate equivalent to 14 to 40 milliliters of phosphoric acid having a density of 1.71 g/ml, nitrate equivalent to 1 to 40 grams of sodium nitrate, and zinc equivalent to 10 to 50 grams of anhydrous zinc chloride, said solution having a pH between 2.3 and 3.8, and a temperature between 15° and 75° C., for between 20 and 72 hours at the aforesaid temperature, and rinsing said surface with water.
Claim 3
Dependent Claim
26 words
A process according to claim 1, in which said solution contains also hexametaphosphate equivalent to up to 70 grams of sodium hexametaphosphate per liter of solution.
Claim 4
Dependent Claim
24 words
A process according to claim 2, in which said solution contains also nickel equivalent to 0.5 to 20 grams per liter of nickel chloride.
Claim 5
Dependent Claim
24 words
A process according to claim 1, in which said solution contains also nickel equivalent to 0.5 to 20 grams per liter of nickel chloride.
Claim 6
Dependent Claim
18 words
An article having a zinc surface which has been treated in accordance with the process of claim 1.
Claim 7
Dependent Claim
18 words
An article having a zinc surface which has been treated in accordance with the process of claim 2.
Claim 8
Dependent Claim
18 words
An article having a zinc surface which has been treated in accordance with the process of claim 3.
Claim 9
Dependent Claim
18 words
An article having a zinc surface which has been treated in accordance with the process of claim 4.
Claim 10
Dependent Claim
104 words
A process for depositing a protective coating on zinc-coated ferrous metal parts, comprising contacting said parts for between 20 and 72 hours with an aqueous solution which contains, per liter of final solution, from 1 to 40 grams of sodium metasilicate, from 14 to 40 milliliters of phosphoric acid having a density of 1.71 g/ml, from 1 to 40 grams of sodium nitrate, and from 10 to 50 grams of anhydrous zinc chloride, the pH of said solution being adjusted to a value between 2.3 and 3.8, said solution having a temperature of 15° to 75° C., and then rinsing said parts with water.
Claim 11
Dependent Claim
104 words
A process for depositing a protective coating on zinc-coated ferrous metal parts, comprising contacting said parts for between 20 and 72 hours with an aqueous solution which contains, per liter of final solution, from 1 to 40 grams of sodium metasilicate, from 14 to 40 milliliters of phosphoric acid having a density of 1.71 g/ml, from 1 to 40 grams of sodium nitrate, and from 10 to 50 grams of anhydrous zinc chloride, the pH of said solution being adjusted to a value between 2.3 and 3.8, said solution having a temperature of 15° to 75° C., and then rinsing said parts with water.
Claim 12
Dependent Claim
23 words
A process according to claim 9 in which said solution contains up to 70 grams of sodium hexametaphosphate per liter of final solution.
Claim 13
Dependent Claim
37 words
A process according to claim 10 in which said solution contains from 0.5 to 20 grams of nickel chloride per liter of final solution, said nickel chloride being added before adjustment of the pH of said solution.
Claim 14
Dependent Claim
31 words
A process according to claim 10 for depositing a protective coating on the inner surface of zinc-coated steel piping, including circulating said solution through said piping, and filtering said circulating solution.
Claim 15
Dependent Claim
15 words
A process according to claim 12 in which said circulating of said solution is intermittent.
Claim 16
Dependent Claim
22 words
A process according to claim 10 comprising contacting said parts in a vessel containing said solution, while filtering and recycling said solution.
Claim 17
Dependent Claim
38 words
A process according to claim 9 in which said solution contains from 0.5 to 20 grams of nickel chloride per liter of final solution, said nickel chloride being added before adjustment of the pH value of said solution.
Claim 18
Dependent Claim
31 words
A process according to claim 9 for depositing a protective coating on the inner surface of zinc-coated steel piping, including circulating said solution through said piping, and filtering said circulating solution.
Claim 19
Dependent Claim
15 words
A process according to claim 16 in which said circulating of said solution is intermittent.
Claim 20
Dependent Claim
22 words
A process according to claim 9 comprising contacting said parts in a vessel containing said solution, while filtering and recycling said solution.
Claim 21
Dependent Claim
17 words
Galvanized parts on which a protective coating has been deposited by a process according to claim 9.
Claim 22
Dependent Claim
17 words
Galvanized parts on which a protective coating has been deposited by a process according to claim 10.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |